What is the ∇ in math?
Excuse me, could you please clarify what the symbol "∇" represents in mathematics? I'm familiar with some basic mathematical notations, but I'm not quite sure what this particular symbol stands for. Is it related to calculus, perhaps? Or is it used in a specific branch of mathematics that I'm not as familiar with? I'd appreciate any insight you could provide on this matter. Thank you in advance for your help.